Question

verify euler's formula for cuboid prism of pentagon base,pyramid of square and pentagon base

Answer 1

Euler's formula = F+V-E= 2
F= faces
V= vertices 
E = edges

cuboid Prism= 6+8-12= 2
pentagonal= 7+10-15= 2
square= 5+5-8= 2
pyramid= 6+6-10=2

Answer 2

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